
.back_header{
	position:relative;
}

.back_header_img{
	position:absolute;
	left:0;
	height:80px;
	width:30%;
}

.back_header_img img{
	margin-top:15px;
	margin-left:150px;
	height:50px;
	width:120px;
}

.back_header_center{
	position:absolute;
	width:20%;
	left:40%;
	top:30px;
}

.back_header_center>p{
	text-align:center;
	color:white;
	height:30px;
	line-height:30px;
	font-size:16px;
}

.back_header_right{
	padding-top:20px;
	width:18%; 
	position:absolute;
	right:50px;
	line-height:20px;
}

.back_header_right p{
	color:white;	
}

.back_current_user{
	color:black;
	text-decoration:underline;
}

.back_exit{
	color:red;
	cursor:pointer;
}

#help_tree a{
	text-decoration:none;
	color:#000;
}

.back_copyright{
	height:30px;;
	line-height:30px;
	text-align:center;
	font-size:16px;
	margin-top:10px;
	color:white;
}

